Indeed, I have to continue testing with the gold material; in another context with different lighting does not cause artifacts.

The material of the chair is only a color + noise procedural texture on bump. I must continue testing to improve it.

The carpet is made with the displace modifier, a finely cube subdivided + subsuf simple. Only color on diffuse (two materials) and a bitmap for displacement and bump.

_Mo_ Friend, no secrets, only trial and error, time and hobby. I am slowly learning things, I sometimes betrays the haste.

Lighting is a sun slanted through a side window and a area light in the window. To the right of the camera and out of focus a plane emitter to illuminate the right side more and try to simulate the sun bounces.